/*** $Id: llex.c,v 2.61 2012/01/23 23:05:51 roberto Exp $** Lexical Analyzer** See Copyright Notice in lua.h*/  #include <locale.h>#include <string.h> #define llex_c#define LUA_CORE #include "lua.h" #include "lctype.h"#include "ldo.h"#include "llex.h"#include "lobject.h"#include "lparser.h"#include "lstate.h"#include "lstring.h"#include "ltable.h"#include "lzio.h"   #define next(ls) (ls->current = zgetc(ls->z))   #define currIsNewline(ls)	(ls->current == '\n' || ls->current == '\r')  /* ORDER RESERVED */static const char *const luaX_tokens [] = {    "and", "break", "do", "else", "elseif",    "end", "false", "for", "function", "goto", "if",    "in", "local", "nil", "not", "or", "repeat",    "return", "then", "true", "until", "while",    "..", "...", "==", ">=", "<=", "~=", "::", "<eof>",    "<number>", "<name>", "<string>"};  #define save_and_next(ls) (save(ls, ls->current), next(ls))  static l_noret lexerror (LexState *ls, const char *msg, int token);  static void save (LexState *ls, int c) {  Mbuffer *b = ls->buff;  if (luaZ_bufflen(b) + 1 > luaZ_sizebuffer(b)) {    size_t newsize;    if (luaZ_sizebuffer(b) >= MAX_SIZET/2)      lexerror(ls, "lexical element too long", 0);    newsize = luaZ_sizebuffer(b) * 2;    luaZ_resizebuffer(ls->L, b, newsize);  }  b->buffer[luaZ_bufflen(b)++] = cast(char, c);}  void luaX_init (lua_State *L) {  int i;  for (i=0; i<NUM_RESERVED; i++) {    TString *ts = luaS_new(L, luaX_tokens[i]);    luaS_fix(ts);  /* reserved words are never collected */    ts->tsv.extra = cast_byte(i+1);  /* reserved word */  }}  const char *luaX_token2str (LexState *ls, int token) {  if (token < FIRST_RESERVED) {    lua_assert(token == cast(unsigned char, token));    return (lisprint(token)) ? luaO_pushfstring(ls->L, LUA_QL("%c"), token) :                              luaO_pushfstring(ls->L, "char(%d)", token);  }  else {    const char *s = luaX_tokens[token - FIRST_RESERVED];    if (token < TK_EOS)      return luaO_pushfstring(ls->L, LUA_QS, s);    else      return s;  }}  static const char *txtToken (LexState *ls, int token) {  switch (token) {    case TK_NAME:    case TK_STRING:    case TK_NUMBER:      save(ls, '\0');      return luaO_pushfstring(ls->L, LUA_QS, luaZ_buffer(ls->buff));    default:      return luaX_token2str(ls, token);  }}  static l_noret lexerror (LexState *ls, const char *msg, int token) {  char buff[LUA_IDSIZE];  luaO_chunkid(buff, getstr(ls->source), LUA_IDSIZE);  msg = luaO_pushfstring(ls->L, "%s:%d: %s", buff, ls->linenumber, msg);  if (token)    luaO_pushfstring(ls->L, "%s near %s", msg, txtToken(ls, token));  luaD_throw(ls->L, LUA_ERRSYNTAX);}  l_noret luaX_syntaxerror (LexState *ls, const char *msg) {  lexerror(ls, msg, ls->t.token);}  /*** creates a new string and anchors it in function's table so that** it will not be collected until the end of the function's compilation** (by that time it should be anchored in function's prototype)*/TString *luaX_newstring (LexState *ls, const char *str, size_t l) {  lua_State *L = ls->L;  TValue *o;  /* entry for `str' */  TString *ts = luaS_newlstr(L, str, l);  /* create new string */  setsvalue2s(L, L->top++, ts);  /* temporarily anchor it in stack */  o = luaH_set(L, ls->fs->h, L->top - 1);  if (ttisnil(o)) {  /* not in use yet? (see 'addK') */    /* boolean value does not need GC barrier;       table has no metatable, so it does not need to invalidate cache */    setbvalue(o, 1);  /* t[string] = true */    luaC_checkGC(L);  }  L->top--;  /* remove string from stack */  return ts;}  /*** increment line number and skips newline sequence (any of** \n, \r, \n\r, or \r\n)*/static void inclinenumber (LexState *ls) {  int old = ls->current;  lua_assert(currIsNewline(ls));  next(ls);  /* skip `\n' or `\r' */  if (currIsNewline(ls) && ls->current != old)    next(ls);  /* skip `\n\r' or `\r\n' */  if (++ls->linenumber >= MAX_INT)    luaX_syntaxerror(ls, "chunk has too many lines");}  void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source,                    int firstchar) {  ls->decpoint = '.';  ls->L = L;  ls->current = firstchar;  ls->lookahead.token = TK_EOS;  /* no look-ahead token */  ls->z = z;  ls->fs = NULL;  ls->linenumber = 1;  ls->lastline = 1;  ls->source = source;  ls->envn = luaS_new(L, LUA_ENV);  /* create env name */  luaS_fix(ls->envn);  /* never collect this name */  luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER);  /* initialize buffer */}   /*** =======================================================** LEXICAL ANALYZER** =======================================================*/   static int check_next (LexState *ls, const char *set) {  if (ls->current == '\0' || !strchr(set, ls->current))    return 0;  save_and_next(ls);  return 1;}  /*** change all characters 'from' in buffer to 'to'*/static void buffreplace (LexState *ls, char from, char to) {  size_t n = luaZ_bufflen(ls->buff);  char *p = luaZ_buffer(ls->buff);  while (n--)    if (p[n] == from) p[n] = to;}  #if !defined(getlocaledecpoint)#define getlocaledecpoint()	(localeconv()->decimal_point[0])#endif  #define buff2d(b,e)	luaO_str2d(luaZ_buffer(b), luaZ_bufflen(b) - 1, e) /*** in case of format error, try to change decimal point separator to** the one defined in the current locale and check again*/static void trydecpoint (LexState *ls, SemInfo *seminfo) {  char old = ls->decpoint;  ls->decpoint = getlocaledecpoint();  buffreplace(ls, old, ls->decpoint);  /* try new decimal separator */  if (!buff2d(ls->buff, &seminfo->r)) {    /* format error with correct decimal point: no more options */    buffreplace(ls, ls->decpoint, '.');  /* undo change (for error message) */    lexerror(ls, "malformed number", TK_NUMBER);  }}  /* LUA_NUMBER *//*** this function is quite liberal in what it accepts, as 'luaO_str2d'** will reject ill-formed numerals.*/static void read_numeral (LexState *ls, SemInfo *seminfo) {  const char *expo = "Ee";  int first = ls->current;  lua_assert(lisdigit(ls->current));  save_and_next(ls);  if (first == '0' && check_next(ls, "Xx"))  /* hexadecimal? */    expo = "Pp";  for (;;) {    if (check_next(ls, expo))  /* exponent part? */      check_next(ls, "+-");  /* optional exponent sign */    if (lisxdigit(ls->current) || ls->current == '.')      save_and_next(ls);    else  break;  }  save(ls, '\0');  buffreplace(ls, '.', ls->decpoint);  /* follow locale for decimal point */  if (!buff2d(ls->buff, &seminfo->r))  /* format error? */    trydecpoint(ls, seminfo); /* try to update decimal point separator */}  /*** skip a sequence '[=*[' or ']=*]' and return its number of '='s or** -1 if sequence is malformed*/static int skip_sep (LexState *ls) {  int count = 0;  int s = ls->current;  lua_assert(s == '[' || s == ']');  save_and_next(ls);  while (ls->current == '=') {    save_and_next(ls);    count++;  }  return (ls->current == s) ? count : (-count) - 1;}  static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {  save_and_next(ls);  /* skip 2nd `[' */  if (currIsNewline(ls))  /* string starts with a newline? */    inclinenumber(ls);  /* skip it */  for (;;) {    switch (ls->current) {      case EOZ:        lexerror(ls, (seminfo) ? "unfinished long string" :                                 "unfinished long comment", TK_EOS);        break;  /* to avoid warnings */      case ']': {        if (skip_sep(ls) == sep) {          save_and_next(ls);  /* skip 2nd `]' */          goto endloop;        }        break;      }      case '\n': case '\r': {        save(ls, '\n');        inclinenumber(ls);        if (!seminfo) luaZ_resetbuffer(ls->buff);  /* avoid wasting space */        break;      }      default: {        if (seminfo) save_and_next(ls);        else next(ls);      }    }  } endloop:  if (seminfo)    seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + (2 + sep),                                     luaZ_bufflen(ls->buff) - 2*(2 + sep));}  static void escerror (LexState *ls, int *c, int n, const char *msg) {  int i;  luaZ_resetbuffer(ls->buff);  /* prepare error message */  save(ls, '\\');  for (i = 0; i < n && c[i] != EOZ; i++)    save(ls, c[i]);  lexerror(ls, msg, TK_STRING);}  static int readhexaesc (LexState *ls) {  int c[3], i;  /* keep input for error message */  int r = 0;  /* result accumulator */  c[0] = 'x';  /* for error message */  for (i = 1; i < 3; i++) {  /* read two hexa digits */    c[i] = next(ls);    if (!lisxdigit(c[i]))      escerror(ls, c, i + 1, "hexadecimal digit expected");    r = (r << 4) + luaO_hexavalue(c[i]);  }  return r;}  static int readdecesc (LexState *ls) {  int c[3], i;  int r = 0;  /* result accumulator */  for (i = 0; i < 3 && lisdigit(ls->current); i++) {  /* read up to 3 digits */    c[i] = ls->current;    r = 10*r + c[i] - '0';    next(ls);  }  if (r > UCHAR_MAX)    escerror(ls, c, i, "decimal escape too large");  return r;}  static void read_string (LexState *ls, int del, SemInfo *seminfo) {  save_and_next(ls);  /* keep delimiter (for error messages) */  while (ls->current != del) {    switch (ls->current) {      case EOZ:        lexerror(ls, "unfinished string", TK_EOS);        break;  /* to avoid warnings */      case '\n':      case '\r':        lexerror(ls, "unfinished string", TK_STRING);        break;  /* to avoid warnings */      case '\\': {  /* escape sequences */        int c;  /* final character to be saved */        next(ls);  /* do not save the `\' */        switch (ls->current) {          case 'a': c = '\a'; goto read_save;          case 'b': c = '\b'; goto read_save;          case 'f': c = '\f'; goto read_save;          case 'n': c = '\n'; goto read_save;          case 'r': c = '\r'; goto read_save;          case 't': c = '\t'; goto read_save;          case 'v': c = '\v'; goto read_save;          case 'x': c = readhexaesc(ls); goto read_save;          case '\n': case '\r':            inclinenumber(ls); c = '\n'; goto only_save;          case '\\': case '\"': case '\'':            c = ls->current; goto read_save;          case EOZ: goto no_save;  /* will raise an error next loop */          case 'z': {  /* zap following span of spaces */            next(ls);  /* skip the 'z' */            while (lisspace(ls->current)) {              if (currIsNewline(ls)) inclinenumber(ls);              else next(ls);            }            goto no_save;          }          default: {            if (!lisdigit(ls->current))              escerror(ls, &ls->current, 1, "invalid escape sequence");            /* digital escape \ddd */            c = readdecesc(ls);            goto only_save;          }        }       read_save: next(ls);  /* read next character */       only_save: save(ls, c);  /* save 'c' */       no_save: break;      }      default:        save_and_next(ls);    }  }  save_and_next(ls);  /* skip delimiter */  seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,                                   luaZ_bufflen(ls->buff) - 2);}  static int llex (LexState *ls, SemInfo *seminfo) {  luaZ_resetbuffer(ls->buff);  for (;;) {    switch (ls->current) {      case '\n': case '\r': {  /* line breaks */        inclinenumber(ls);        break;      }      case ' ': case '\f': case '\t': case '\v': {  /* spaces */        next(ls);        break;      }      case '-': {  /* '-' or '--' (comment) */        next(ls);        if (ls->current != '-') return '-';        /* else is a comment */        next(ls);        if (ls->current == '[') {  /* long comment? */          int sep = skip_sep(ls);          luaZ_resetbuffer(ls->buff);  /* `skip_sep' may dirty the buffer */          if (sep >= 0) {            read_long_string(ls, NULL, sep);  /* skip long comment */            luaZ_resetbuffer(ls->buff);  /* previous call may dirty the buff. */            break;          }        }        /* else short comment */        while (!currIsNewline(ls) && ls->current != EOZ)          next(ls);  /* skip until end of line (or end of file) */        break;      }      case '[': {  /* long string or simply '[' */        int sep = skip_sep(ls);        if (sep >= 0) {          read_long_string(ls, seminfo, sep);          return TK_STRING;        }        else if (sep == -1) return '[';        else lexerror(ls, "invalid long string delimiter", TK_STRING);      }      case '=': {        next(ls);        if (ls->current != '=') return '=';        else { next(ls); return TK_EQ; }      }      case '<': {        next(ls);        if (ls->current != '=') return '<';        else { next(ls); return TK_LE; }      }      case '>': {        next(ls);        if (ls->current != '=') return '>';        else { next(ls); return TK_GE; }      }      case '~': {        next(ls);        if (ls->current != '=') return '~';        else { next(ls); return TK_NE; }      }      case ':': {        next(ls);        if (ls->current != ':') return ':';        else { next(ls); return TK_DBCOLON; }      }      case '"': case '\'': {  /* short literal strings */        read_string(ls, ls->current, seminfo);        return TK_STRING;      }      case '.': {  /* '.', '..', '...', or number */        save_and_next(ls);        if (check_next(ls, ".")) {          if (check_next(ls, "."))            return TK_DOTS;   /* '...' */          else return TK_CONCAT;   /* '..' */        }        else if (!lisdigit(ls->current)) return '.';        /* else go through */      }      case '0': case '1': case '2': case '3': case '4':      case '5': case '6': case '7': case '8': case '9': {        read_numeral(ls, seminfo);        return TK_NUMBER;      }      case EOZ: {        return TK_EOS;      }      default: {        if (lislalpha(ls->current)) {  /* identifier or reserved word? */          TString *ts;          do {            save_and_next(ls);          } while (lislalnum(ls->current));          ts = luaX_newstring(ls, luaZ_buffer(ls->buff),                                  luaZ_bufflen(ls->buff));          seminfo->ts = ts;          if (isreserved(ts))  /* reserved word? */            return ts->tsv.extra - 1 + FIRST_RESERVED;          else {            return TK_NAME;          }        }        else {  /* single-char tokens (+ - / ...) */

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